The adjustable depth collar and wing styles cutting edges enable clean hinge installations and efficient wood chip removal, crafted from hardened alloy steel for extended durability across multiple drilling applications Each Forstner drill bit features markings and heat treated construction, ensuring consistent when working with hardwoods, plywood in workshop environments Perfect for creating recessed joints in tabletops, drilling shelf pin holes in bookcases, or preparing concealed hinge cavities for kitchen cabinet doors and architectural woodwork Ideal for professional DIYer enthusiasts requiring accuracy in cabinet hardware mounting, door installations, or furniture fabrication with standard wood materials Engineered with hexagonal shank design, this 5 piece Forstner bit set delivers precise flat bottom holes ( 15-35mm) in woodworking projects while maintaining slip resistant stability in power tools, Manufacturer: ERRORY